Opus Case

Name: Opus Case
Brand: Opus

2025 UrbanFitness Manufacturer page

Suspension: Rigid
Wheels: 700c
Gear range: 243%
Weight: 13.24 kg 29.2 lb · Reference configuration not specified
Frame: Steel
Brakes: Rim brake

Rider height by size (cm)

Size guide

SM 158–170
MD 168–179
LG 176–187

Components

14 of 20 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

Vintage steel frame design Not identified

Suspension

1 part

Fork
- Opus

Drivetrain

7 parts

Bottom bracket

CH-46-E cartridge Not identified

CH-46
Cassette
- Shimano MF-TZ31 14–34t
MF-TZ31TZ-31
Chain
- KMC
KMC-Z51
Crankset

CW alloy single ring Not identified
Front derailleur

None
Rear derailleur
- Shimano Tourney TX RD-TX800 8 speeds
RD-TX800
Shifters
- Shimano Altus SL-M310
SL-M310

Brakes

2 parts

Brake levers
- ProMax
Brakes
- ProMax

Wheels and tires

4 parts

Front hub
- Joytech
Rear hub
- Joytech
Rims

Ace DWS-002 Not identified

DWS-002
Tires
- Vittoria Randonneur

Cockpit and contact points

6 parts

Handlebar
- Opus
Headset

TH threadless Not identified
Pedals

FPD NW-99K Not identified

NW-99K
Saddle
- Opus
Seatpost
- Opus
Stem
- Opus

Sizes and geometry

3 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs wheelbase, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 3 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	385	392	404
Stackmm	557	571	590
Top tube lengthmm	547	563	585
Seat tube lengthmm	460	500	540
Head tube lengthmm	150	165	185
Head tube angle	70°	70°	70°
Seat tube angle	73°	73°	73°
Chainstay lengthmm	432	432	432
Bottom bracket dropmm	70	70	70
Standover heightmm	749	775	803
Stack/reach ratio	1.45	1.46	1.46
Suspension and parts
Crank lengthmm	170	170	170
Handlebar widthmm	600	620	640
Stem lengthmm	60	80	80

Not published by the manufacturer: Wheelbase, Front center, Bottom bracket height, Fork rake, Trail, Front travel, Rear travel, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Steel
Fork material: Steel
Bicycle weight: 13.24 kg

29.2 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 38
Largest chainring: 38
Smallest sprocket: 14
Largest sprocket: 34
Lowest gear: 32.4 in
Highest gear: 78.7 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Rim brake

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Tire width: 40c
Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Lowest gear

32.4 gear inches

This value is above the central range for this class.

Cohort: Urban / Fitness Model year: 2025
Sample: 230 bicycles with this information
Coverage: 81.8% of the class

Highest gear

78.7 gear inches

This value is below the central range for this class.

Cohort: Urban / Fitness Model year: 2025
Sample: 230 bicycles with this information
Coverage: 81.8% of the class

Shifting

Mechanical

13 of 281 bicycles with this information use electronic shifting.

Cohort: Urban / Fitness Model year: 2025
Sample: 281 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 12.4 km/h
Highest gear: 30.1 km/h

Total gear range 243%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 32.4–78.7 gear inches
Class reference (p10–p90): 21.8–131.8 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Urban / Fitness Model year: 2025
Lowest gear: 230 bicycles with this information, 81.8% of the class
Highest gear: 230 bicycles with this information, 81.8% of the class